On March 19, 2012, the Board of Directors of Pinnacle Entertainment, Inc., a Delaware corporation (Pinnacle), elected Desirée Rogers and Jaynie Miller Studenmund to the Board of
Directors. Ms. Rogers and Ms. Studenmund will hold office until the next annual meeting of stockholders (and until their successors shall have been duly elected and qualified). Pinnacle has not yet made a determination as to the committees
of the Board of Directors on which Ms. Rogers and Ms. Studenmund will serve. Ms. Rogers is the Chief Executive Officer of the Johnson Publishing Company, LLC. Ms. Studenmund is a corporate director and advisor and is a director
of Orbitz Worldwide, Inc.

There are currently no arrangements or understandings between Ms. Rogers and
Ms. Studenmund and any other persons pursuant to which they were selected as directors of Pinnacle and Ms. Rogers and Ms. Studenmund are not parties to any transaction that would be required to be disclosed by Pinnacle pursuant to
Item 404(a) of Regulation S-K.

Ms. Rogers and Ms. Studenmund will receive non-employee directors compensation
as previously established and disclosed for the other non-employee directors of Pinnacle. Such compensation includes, among other things, a grant of options to purchase 10,000 shares of Pinnacles common stock. Ms. Rogers and
Ms. Studenmund were each granted such options on March 19, 2012, at an exercise price equal to the closing price of Pinnacles common stock on such date, or $11.13. Each of the options vested immediately on the date of grant with a
term of seven years. Ms. Rogers and Ms. Studenmund shall also be eligible to participate in all other previously established and disclosed plans in which non-employee directors participate. Such compensation and plans are described in
Pinnacles Definitive Proxy Statement filed with the Securities and Exchange Commission on April 12, 2011.

Item 8.01.

Other Events.

On
March 20, 2012, Pinnacle issued a press release announcing the election of Ms. Rogers and Ms. Studenmund to the Board of Directors. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is
incorporated by reference.